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Old 07-22-2024, 01:01 AM   #1
67carry-all
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WTB - Vacuum fitting

Looking for a vacuum fitting with "actual" 3/8" threads (not NPT 3/8") and a small (1/8" or so) fitting for the vacuum hose. The local hardware store has one with what initially looks to be 3/8" threads but it tapers larger and won't fit in the threaded port on my intake. Anybody have such a fitting they'd be willing to part with? Thanks.
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Old 07-29-2024, 11:15 PM   #2
67carry-all
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Re: WTB - Vacuum fitting

So, to follow-up, I used a die to thread the hardware store fitting to a consistent 3/8" diameter. It now fits and so far is working well.
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Old 08-17-2024, 09:33 AM   #3
70STOVEBOLT
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Re: WTB - Vacuum fitting

Just curious, what intake do you have? I’ve not seen an intake with straight threads. Does it take an o-ring fitting?
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Old 08-17-2024, 02:56 PM   #4
67carry-all
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Re: WTB - Vacuum fitting

It's an older Offy on my 292. No o-rings, just apparently straight threads. It's the front one in this pic; I don't remember any issues with the port to the rear, that fitting may have come with the manifold when I got it.
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Old 08-17-2024, 02:57 PM   #5
70STOVEBOLT
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Re: WTB - Vacuum fitting

Interesting. Thanks for the info.
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70 C/10 SWB 402/TH400/3.73 "The Needy Beast"
200,000 Mile Club
Disc Brake Club

Owner installed options:
Front Sway Bar
Power Steering
Power Brakes
Cigar Lighter
Courtesy Lights
Deluxe Side Markers
Wiper Delay
Sliding Rear Window
Power Windows
Power Locks
Sniper EFI

2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear
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